Chapter 30.SE, Problem 25AP

Interpretation Introduction

Interpretation:

Which among the two reactions given is more likely to occur has to be stated and explained.

Concept introduction:

In cycloaddition reaction two unsaturated molecules add to one another to yield a cyclic product.

If even number of electron pair is involved then thermal reaction occur through antarafacial pathway and photochemical reactions occur through suprafacial pathway.

If odd number of electron pair is involved then thermal reaction occur through suprafacial pathway and photochemical reactions occur through antarafacial pathway.

To state and explain:

Which among the two reactions given is more likely to occur.